If you regard being able to converse naturally with correct spelling and grammar as, "sunday best", then you really need to give yourself some thought. Whilst your wkd, l33t friends might think it, "uncool", that's the way of the world I'm afraid.
"Spell properly", "flight-plan properly", "deal with a dead engine an hour from land properly". Melodramatic? Perhaps... But it's all indicative of quality. You either have it or you don't, your choice. There are no short-cuts, and no, "sunday best". Being a good pilot is not simply about how you fly the aircraft, it's about who you are. Airline selection and psychometrics will find you out, that's what they're there for.